The Hewlett Packard SureStore TapeRack holds up to four HP DLT 70r, DLT 40r, and HP DAT24r SureStore drives and fits into a 19-inch rack cabinet.These removable tape drives are especially designed for the TapeRack. They are hot-swappable, enabling you to exchange drives in a matter of seconds without having to shut down and restart your server. These drives, combined with TapeRack's dual hot-swap power supplies, provides you with a non-stop backup capability you can rely on, day in and day out. The TapeRack also features dual redundant load sharing power supplies and fans and parallel streaming on all four drives on two SCSI channels. Please note that the SureStore TapeRack does not come with any drives.HP backs the TapeRack with a three-year on-site warranty.